BOLTING

CHARTS

ANSI B16.5 Bolting Charts
API Flange Bolting Charts

ANSI 150 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	1/2	4	2-1/4	-	-
3/4	1/2	4	2 1/2	-	-
1	1/2	4	2 1/2	3	R15
1 1/4	1/2	4	2 3/4	3 1/4	R17
1 1/2	1/2	4	2 3/4	3 1/4	R19
2	5/8	4	3 1/4	3 3/4	R22
2 1/2	5/8	4	3 1/2	4	R25
3	5/8	4	3 1/2	4 1/4	R29
3 1/2	5/8	8	3 1/2	4 1/4	R33
4	5/8	8	3 1/2	4 1/4	R36
5	3/4	8	3 3/4	4 1/2	R40
6	3/4	8	4	4 1/2	R43
8	3/4	8	4 1/4	4 3/4	R48
10	7/8	12	4 3/4	5 1/4	R52
12	7/8	12	4 3/4	5 1/2	R56
14	1	12	5 1/4	6	R59
16	1	16	5 1/2	6	R64
18	1 1/8	16	6	6 1/2	R68
20	1 1/8	20	6 1/4	7	R72
22	1 1/4	20	6 1/2	7 1/4	R80
24	1 1/4	20	7	7 3/4	R76

ANSI 300 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	1/2	4	2-1/2	3	R11
3/4	5/8	4	3	3 1/4	R13
1	5/8	4	3 1/4	3 1/4	R16
1 1/4	5/8	4	3 1/4	3 3/4	R18
1 1/2	3/4	4	3 1/2	4	R20
2	5/8	8	3 1/2	4 1/4	R23
2 1/2	3/4	8	4	4 1/2	R26
3	3/4	8	4 1/4	5	R31
3 1/2	3/4	8	4 1/4	5	R34
4	3/4	8	4 1/2	5 1/4	R37
5	3/4	8	4 3/4	5 1/4	R41
6	3/4	12	4 3/4	5 3/4	R45
8	7/8	12	5 1/2	6 1/4	R49
10	1	16	6 1/4	7 1/4	R53
12	1 1/8	16	6 3/4	7 1/2	R57
14	1 1/8	20	7	7 3/4	R61
16	1 1/4	20	7 1/2	8 1/4	R65
18	1 1/4	24	7 3/4	8 1/2	R69
20	1 1/4	24	8 1/4	9 1/4	R73
22	1 1/2	24	8 3/4	9 3/4	R81
24	1 1/2	24	9 1/4	10 1/4	R77

ANSI 400 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	1/2	4	3	3	R11
3/4	5/8	4	3 1/2	3 1/2	R13
1	5/8	4	3 1/2	3 1/2	R16
1 1/4	5/8	4	3 3/4	3 3/4	R18
1 1/2	3/4	4	4 1/4	4	R20
2	5/8	8	4 1/4	4 1/4	R23
2 1/2	3/4	8	4 3/4	4 3/4	R26
3	3/4	8	5	5	R31
3 1/2	7/8	8	5 1/2	5 1/2	R34
4	7/8	8	5 1/2	5 1/2	R37
5	7/8	8	5 3/4	5 3/4	R41
6	7/8	12	6	6	R45
8	1	12	6 3/4	6 3/4	R49
10	1 1/8	16	7 1/2	7 1/2	R53
12	1 1/4	16	8	8	R57
14	1 1/4	20	8 1/4	8 1/4	R61
16	1 3/8	20	8 3/4	8 3/4	R65
18	1 3/8	24	9	9	R69
20	1 1/2	24	9 1/2	9 1/2	R73
22	1 5/8	24	10	10 1/2	R81
24	1 3/4	24	10 1/2	11	R77

ANSI 600 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	1/2	4	3	3	R11
3/4	5/8	4	3 1/4	3 1/4	R13
1	5/8	4	3 1/2	3 1/2	R16
1 1/4	5/8	4	3 3/4	3 3/4	R18
1 1/2	3/4	4	4 1/4	4 1/4	R20
2	5/8	8	4 1/4	4 1/2	R23
2 1/2	3/4	8	5	5 1/4	R26
3	3/4	8	5	5 1/4	R31
3 1/2	7/8	8	5 1/2	5 1/2	R34
4	7/8	8	5 3/4	6	R37
5	1	8	6 1/2	6 1/2	R41
6	1	12	6 3/4	7	R45
8	1 1/8	12	7 3/4	8	R49
10	1 1/4	16	8 1/2	8 3/4	R53
12	1 1/4	20	8 3/4	9	R57
14	1 3/8	20	9 1/4	8 1/2	R61
16	1 1/2	20	10	10 1/4	R65
18	1 5/8	20	10 3/4	11	R69
20	1 5/8	24	11 1/2	11 3/4	R73
22	1 3/4	24	12	12 1/2	R81
24	1 7/8	24	13	13 1/2	R77

ANSI 900 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	1/2	4	4	4 1/4	R12
3/4	3/4	4	4 1/4	4 1/4	R14
1	7/8	4	4 3/4	5	R16
1 1/4	7/8	4	5	5	R18
1 1/2	1	4	5 1/4	5 1/2	R20
2	7/8	8	5 1/2	5 3/4	R24
2 1/2	1	8	6 1/4	6 1/4	R27
3	7/8	8	5 1/2	5 3/4	R31
4	1 1/8	8	6 1/2	6 3/4	R37
5	1 1/4	8	7 1/2	7 1/2	R41
6	1 1/8	12	7 1/2	7 3/4	R45
8	1 3/8	12	8 1/2	8 3/4	R49
10	1 3/8	16	9	9 1/4	R53
12	1 1/4	20	8 3/4	9	R57
14	1 1/2	20	10 1/2	11	R62
16	1 5/8	20	11	11 1/2	R66
18	1 7/8	20	12 3/4	13 1/4	R70
20	2	20	13 1/2	14 1/4	R70
24	2 1/2	20	17	18	R78

ANSI 1500 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	3/4	4	4	4 1/4	R12
3/4	3/4	4	4 1/4	4 1/2	R14
1	7/8	4	4 3/4	5	R16
1 1/4	7/8	4	5	5	R18
1 1/2	1	4	5 1/4	5 1/2	R20
2	7/8	8	5 1/2	5 3/4	R24
2 1/2	1	8	6 1/4	6 1/4	R27
3	1 1/8	8	6 3/4	7	R35
4	1 1/4	8	7 1/2	7 3/4	R39
5	1 1/2	8	9 3/4	9 3/4	R44
6	1 3/8	12	10	10 1/2	R46
8	1 5/8	12	11 1/4	11 3/4	R50
10	1 7/8	12	13 1/4	13 1/2	R54
12	2	16	14 3/4	15 1/4	R58
14	2 1/4	16	16	16 3/4	R63
16	2 1/2	16	17 1/2	18 1/2	R67
18	2 3/4	16	19 1/4	20 1/4	R71
20	3	16	21	22 1/4	R75
24	3 1/2	16	24	25 1/2	R79

ANSI 2500 LB

NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	STUD BOLT LENGTHS		RING JOINT GASKET NO.
NOMINAL PIPE SIZE	DIAMETER OF STUDS	NO. OF STUDS	RAISED FACED	RING JOINT	RING JOINT GASKET NO.
1/2	3/4	4	4 3/4	4 3/4	R13
3/4	3/4	4	4 3/4	5	R16
1	7/8	4	5 1/4	5 1/2	R18
1 1/4	1	4	6	6	R21
1 1/2	1 1/8	4	6 1/2	6 3/4	R23
2	1	8	6 3/4	7	R26
2 1/2	1 1/8	8	7 3/4	8	R28
3	1 1/4	8	8 1/2	9	R32
4	1 1/2	8	9 3/4	10 1/4	R38
5	1 3/4	8	11 3/4	12 1/4	R42
6	2	8	13 1/2	14	R47
8	2	12	15	15 1/2	R51
10	2 1/2	12	19	20	R55
12	2 3/4	12	21	22	R60

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2000 WP

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
2 1/16	R23	8	5/8	4 1/2
2 9/16	R26	8	3/4	5
3 1/8	R31	8	3/4	5 1/4
4 1/16	R37	8	7/8	6
5 1/8	R41	8	1	6 3/4
7 1/16	R45	12	1	7
9	R49	12	1 1/8	8
11	R53	16	1 1/4	8 3/4
13 5/8	R57	20	1 1/4	9
16 3/4	R65	20	1 1/2	10 1/4
21 1/4	R73	24	1 5/8	11 3/4
26 3/4	BX167	20	1 3/4	13 3/4

3000 LB W.P.

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
3 1/8	R31	8	7/8	6
4 1/16	R37	8	1 1/8	7
5 1/8	R41	8	1 1/4	7 3/4
7 1/16	R45	12	1 1/8	8
9	R49	12	1 3/8	9
11	R53	16	1 3/8	9 1/2
13 5/8	R57	20	1 3/8	10 1/4
16 3/4	R66	20	1 5/8	11 3/4
20 3/4	R74	20	2	14 1/2
26 3/4	BX168	24	2	17

5000 LB W.P.

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
2 1/16	R24	8	7/8	6
2 9/16	R27	8	1	6 1/2
3 1/8	R35	8	1 1/8	7 1/4
4 1/16	R39	8	1 1/4	8
5 1/8	R44	8	1 1/2	10
7 1/16	R46	12	1 3/8	10 3/4
9	R50	12	1 5/8	12
11	R54	12	1 7/8	13 3/4
13 5/8	BX160	16	1 5/8	12 1/2
16 3/4	BX162	16	1 7/8	14 1/2
18 3/4	BX163	20	2	17 1/2
21 1/4	BX165	24	2	18 3/4

10,000 LB W.P.

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
1 13/16	BX151	8	3/4	5
2 1/16	BX152	8	3/4	5 1/4
2 9/16	BX153	8	7/8	6
3 1/16	BX154	8	1	6 3/4
4 1/16	BX155	8	1 1/8	8
5 1/8	BX169	12	1 1/8	8 3/4
7 1/16	BX156	12	1 1/2	11 1/4
9	BX157	16	1 1/2	13
11	BX158	16	1 3/4	15
13 5/8	BX159	20	1 7/8	17 1/4
16 3/4	BX162	24	1 7/8	17 1/2
18 3/4	BX164	24	2 1/4	22 1/2
21 1/4	BX166	24	2 1/4	24 1/2

15,000 LB W.P.

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
1 13/16	BX151	8	7/8	5 1/2
2 1/16	BX152	8	7/8	6
2 9/16	BX153	8	1	6 3/4
3 1/16	BX154	8	1 1/8	7 1/2
4 1/16	BX155	8	1 3/8	9 1/4
5 1/8	BX169	12	1 1/2	11 1/2
7 1/16	BX156	16	1 1/2	12 3/4
9	BX157	16	1 7/8	15 3/4
11	BX158	20	2	19 1/4
13 5/8	BX159	20	2 1/4	21 1/4
18 3/4	BX164	20	3	26 3/4

20,000 LB W.P.

NOMINAL SIZE	GASKET API NUMBER	NUMBER OF STUDS	STUD BOLT DIAMETER	STUD BOLT LENGTHS
1 13/16	BX151	8	1	7 1/2
2 1/16	BX152	8	1 1/8	8 1/4
2 9/16	BX153	8	1 1/4	9 1/4
3 1/16	BX154	8	1 3/8	10
4 1/16	BX155	8	1 3/4	12 1/4
7 1/16	BX156	16	2	17 1/2
9	BX157	16	2 1/2	22 1/2
11	BX158	20	2 3/4	23 3/4
13 5/8	BX159	20	3	30

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